Monte Carlo simulation of a prototypical patient dosimetry system for fluoroscopic procedures

Lukas Goertz, Panagiotis Tsiamas, Andrew Karellas, Erno Sajo, Piotr Zygmanski

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The purpose of this study is to investigate feasibility of a novel real-time dosimetry method for fluoroscopically guided interventions utilizing thin-film detector arrays in several potential locations with respect to the patient and x-ray equipment. We employed Monte Carlo (MC) simulation to establish the fluoroscopic beam model to determine dosimetric quantities directly from measured doses in thin-film detector arrays at three positions: A-attached to the x-ray source, B-on the couch under the patient and C-attached to the fluoroscopic imager. Next, we developed a calibration method to determine skin dose at the entry of the beam (Dentr) as well as the dose distribution along each ray of the beam in a water-equivalent patient model. We utilized the concept of water-equivalent thickness to determine the dose inside the patient based on doses measured outside of the patient by the thin-film detector array layers: (a) A, (b) B, or (c) B and C. In the process of calibration we determined a correction factor that characterizes the material-specific response of the detector, backscatter factor and attenuation factor for slab water phantoms of various thicknesses. Application of this method to an anthropomorphic phantom showed accuracy of about 1% for Dentr and up to about 10% for integral dose along the beam path when compared to a direct simulation of dose by MC.

Original languageEnglish (US)
Pages (from-to)5891-5909
Number of pages19
JournalPhysics in medicine and biology
Volume60
Issue number15
DOIs
StatePublished - Aug 7 2015
Externally publishedYes

Fingerprint

Calibration
Water
X-Rays
Equipment and Supplies
Skin

Keywords

  • entrance dose
  • fluoroscopy
  • integral dose
  • Monte Carlo
  • peak skin dose
  • real-time dosimetry
  • thin-film detector arrays

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

Cite this

Monte Carlo simulation of a prototypical patient dosimetry system for fluoroscopic procedures. / Goertz, Lukas; Tsiamas, Panagiotis; Karellas, Andrew; Sajo, Erno; Zygmanski, Piotr.

In: Physics in medicine and biology, Vol. 60, No. 15, 07.08.2015, p. 5891-5909.

Research output: Contribution to journalArticle

Goertz, Lukas ; Tsiamas, Panagiotis ; Karellas, Andrew ; Sajo, Erno ; Zygmanski, Piotr. / Monte Carlo simulation of a prototypical patient dosimetry system for fluoroscopic procedures. In: Physics in medicine and biology. 2015 ; Vol. 60, No. 15. pp. 5891-5909.
@article{c358e3caa5f549a5887ce408dc512e6d,
title = "Monte Carlo simulation of a prototypical patient dosimetry system for fluoroscopic procedures",
abstract = "The purpose of this study is to investigate feasibility of a novel real-time dosimetry method for fluoroscopically guided interventions utilizing thin-film detector arrays in several potential locations with respect to the patient and x-ray equipment. We employed Monte Carlo (MC) simulation to establish the fluoroscopic beam model to determine dosimetric quantities directly from measured doses in thin-film detector arrays at three positions: A-attached to the x-ray source, B-on the couch under the patient and C-attached to the fluoroscopic imager. Next, we developed a calibration method to determine skin dose at the entry of the beam (Dentr) as well as the dose distribution along each ray of the beam in a water-equivalent patient model. We utilized the concept of water-equivalent thickness to determine the dose inside the patient based on doses measured outside of the patient by the thin-film detector array layers: (a) A, (b) B, or (c) B and C. In the process of calibration we determined a correction factor that characterizes the material-specific response of the detector, backscatter factor and attenuation factor for slab water phantoms of various thicknesses. Application of this method to an anthropomorphic phantom showed accuracy of about 1{\%} for Dentr and up to about 10{\%} for integral dose along the beam path when compared to a direct simulation of dose by MC.",
keywords = "entrance dose, fluoroscopy, integral dose, Monte Carlo, peak skin dose, real-time dosimetry, thin-film detector arrays",
author = "Lukas Goertz and Panagiotis Tsiamas and Andrew Karellas and Erno Sajo and Piotr Zygmanski",
year = "2015",
month = "8",
day = "7",
doi = "10.1088/0031-9155/60/15/5891",
language = "English (US)",
volume = "60",
pages = "5891--5909",
journal = "Physics in Medicine and Biology",
issn = "0031-9155",
publisher = "IOP Publishing Ltd.",
number = "15",

}

TY - JOUR

T1 - Monte Carlo simulation of a prototypical patient dosimetry system for fluoroscopic procedures

AU - Goertz, Lukas

AU - Tsiamas, Panagiotis

AU - Karellas, Andrew

AU - Sajo, Erno

AU - Zygmanski, Piotr

PY - 2015/8/7

Y1 - 2015/8/7

N2 - The purpose of this study is to investigate feasibility of a novel real-time dosimetry method for fluoroscopically guided interventions utilizing thin-film detector arrays in several potential locations with respect to the patient and x-ray equipment. We employed Monte Carlo (MC) simulation to establish the fluoroscopic beam model to determine dosimetric quantities directly from measured doses in thin-film detector arrays at three positions: A-attached to the x-ray source, B-on the couch under the patient and C-attached to the fluoroscopic imager. Next, we developed a calibration method to determine skin dose at the entry of the beam (Dentr) as well as the dose distribution along each ray of the beam in a water-equivalent patient model. We utilized the concept of water-equivalent thickness to determine the dose inside the patient based on doses measured outside of the patient by the thin-film detector array layers: (a) A, (b) B, or (c) B and C. In the process of calibration we determined a correction factor that characterizes the material-specific response of the detector, backscatter factor and attenuation factor for slab water phantoms of various thicknesses. Application of this method to an anthropomorphic phantom showed accuracy of about 1% for Dentr and up to about 10% for integral dose along the beam path when compared to a direct simulation of dose by MC.

AB - The purpose of this study is to investigate feasibility of a novel real-time dosimetry method for fluoroscopically guided interventions utilizing thin-film detector arrays in several potential locations with respect to the patient and x-ray equipment. We employed Monte Carlo (MC) simulation to establish the fluoroscopic beam model to determine dosimetric quantities directly from measured doses in thin-film detector arrays at three positions: A-attached to the x-ray source, B-on the couch under the patient and C-attached to the fluoroscopic imager. Next, we developed a calibration method to determine skin dose at the entry of the beam (Dentr) as well as the dose distribution along each ray of the beam in a water-equivalent patient model. We utilized the concept of water-equivalent thickness to determine the dose inside the patient based on doses measured outside of the patient by the thin-film detector array layers: (a) A, (b) B, or (c) B and C. In the process of calibration we determined a correction factor that characterizes the material-specific response of the detector, backscatter factor and attenuation factor for slab water phantoms of various thicknesses. Application of this method to an anthropomorphic phantom showed accuracy of about 1% for Dentr and up to about 10% for integral dose along the beam path when compared to a direct simulation of dose by MC.

KW - entrance dose

KW - fluoroscopy

KW - integral dose

KW - Monte Carlo

KW - peak skin dose

KW - real-time dosimetry

KW - thin-film detector arrays

UR - http://www.scopus.com/inward/record.url?scp=84938073320&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84938073320&partnerID=8YFLogxK

U2 - 10.1088/0031-9155/60/15/5891

DO - 10.1088/0031-9155/60/15/5891

M3 - Article

C2 - 26184743

AN - SCOPUS:84938073320

VL - 60

SP - 5891

EP - 5909

JO - Physics in Medicine and Biology

JF - Physics in Medicine and Biology

SN - 0031-9155

IS - 15

ER -